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Epiphytic small ferns. Rhizome long-creeping, filiform, and sparsely covered with scales, dorsally with 2 rows of fronds, sparsely set with roots, without or with a few scattered sclerenchyma strands. Rhizome scales basifixed, peltate, ovate to narrowly ovate, clathrate, dentate to lacerate. Fronds simple, mono-to dimorphic, entire, stipitate. Lamina more or less succulent, glabrous or with sparse, deciduous scales. Venation: midrib usually distinct, veins indistinct, forming 2 or 3 rows of areoles, mostly with included, forked, recurrent free veinlets. Sori round to elliptic or forming longitudinal coenosori, covered with deciduous peltate scale-like paraphyses when young. Receptacular paraphyses filiform, basifixed or peltate, clathrate, mostly deciduous.
Rhizome long-creeping, slender, scaly and bearing densely matted, dark, hairy roots; scales small, dark, clathrate. Stipes short, articulated to the rhizome and spaced along it. Lamina simple, entire, decurrent on the stipe. Sterile and fertile laminas moderately dimorphic; sterile lamina short and broad; fertile lamina narrowed throughout or narrowed only in the upper fertile part; stellate hairs absent. Midvein usually prominent; other veins obscure, immersed in the substance of the lamina; veinlets directed downwards and inwards towards the midvein. Sori round and distinct, or (not in Australia) forming a continuous band on each side of the midrib in the fertile apical portion of the frond; immature sporangia protected by umbrella-shaped paraphyses.
Fronds small, fertile ones (or fertile parts) contracted
